[enterprise-4.15] OSDOCS-15277 [NETOBSERV] Restructure of rel notes for 1.8.1 and 1.8.0 on enterprise-4.15

[gwynnemonahan]

https://issues.redhat.com/browse/OSDOCS-15277 OSDOCS-15277 [NETOBSERV] Restructure of rel notes for 1.8.1 and 1.8.0 on enterprise-4.15

Version(s):
4.15

Issue:
https://issues.redhat.com/browse/OSDOCS-15277

Link to docs preview:

• 1.8.1 rel notes overview: https://96012--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/network-observability-operator-assembly_release-notes-1-8-1.html#network-observability-ref_release-notes-overview-1-8-1_network-observability-operator-release-notes-v1-8-1
• 1.8.1 rel notes advisory: https://96012--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/network-observability-operator-assembly_release-notes-1-8-1.html#network-observability-advisory-1-8-1_network-observability-operator-release-notes-v1-8-1
• 1.8.1 rel notes CVEs: https://96012--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/network-observability-operator-assembly_release-notes-1-8-1.html#network-observability-operator-CVE-1-8-1_network-observability-operator-release-notes-v1-8-1
• 1.8.1 rel notes bug fix: https://96012--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/network-observability-operator-assembly_release-notes-1-8-1.html#network-observability-ref_release-notes-bug-fix-1-8-1_network-observability-operator-release-notes-v1-8-1

QE review:
QE review is not required for this PR as it is refactoring/restructuring existing content.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Jul 11 17:48:36 - Prow CI generated the docs preview:

https://96012--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/network-observability-operator-assembly_release-notes-1-8-1.html

[openshift-ci]

@gwynnemonahan: all tests passed!

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